1922.] F. F. Laidlaw : Indian Dragon/lies. 379 



triangle. Sectors of arculus approximated about 1 mm. after their 

 origin. Forking of M,_ 2 and M g unsymmetrical in both pairs of 

 wings. One or two cross-nerves in the submedian space (number 

 apparently varying according to species and sex). Triangle of 

 hinder-wing occasionally crossed. Pterostigma unbraced. Upper 

 pair of anal appendages of male carrying a remarkable apical process, 

 so that the two processes are together somewhat lyre-shaped. 

 Hamuli small, vesicle of penis large and prominent. Ninth segment 

 of abdomen shorter than eighth. Size moderate, colouring rather 

 sombre, with (usually) fine, longitudinal, dorsal line on segments 

 3-7 of the abdomen. Appearance of adult male, more particularly 

 of the abdomen, very like that of Anisogomphus. 



The following species appear to me to be clearly referable to 

 this genus : H. nietneri Hagen, from Ceylon and Assam (from the 

 latter locality possibly as a geographical race) ; H. gracilis Kriiger, 

 from Sumatra; H. relroplexus (Ris), from Tonkin; and H . scorpio 

 (Ris), from Yunnan. 



The generic separation of these species has been clearly fore- 

 shadowed by Ris, and hinted at by Williamson and Kriiger. 

 Though I cannot claim to have had the opportunity of making as 

 detailed a study of the species of this genus and of Leptogomphus , 

 s. restr., as any of these writers, it seems to me that a faunistic 

 paper of the character of this on which I am now engaged affords 

 a suitable opportunity for defining this new genus. 



Heliogomphus nietneri (Selys). 

 16, 1 9. Tura, Garo Hills, Assam, 1500 ft. S. Kemp. (7977/m). 

 These specimens are clearly examples of the same form as 

 that described in the ' Odonates 

 de Birmanie ' by de Selys, which 

 was regarded by him as being 

 conspecific with Hagen 's species 

 from Ceylon. Not having any 

 examples from the latter locality 

 with which to compare the Assa- 

 mese material I follow de Selys 

 in leaving the specimens under 

 this name, though I believe it ^ IG - 3-— Anal appendages of Helio- 



tlOt Ulllikelv that they may prove gomphm nietneri Selys, seen 



, , - ,. f J v Irom above. 



to belong to a distinct race or 

 even to a distinct species. 



From Hagen 's description they differ chiefly in having the two 

 lateral black bands on the synthorax along the lines of the lateral 

 sutures, the posterior band not being ' presque terminale.' The 

 male has no lateral yellow markings on an}- of the segments 

 beyond the fourth, whilst the pterostigma is brownish-black. In 

 general appearance, and especially in the colouring and shape of 

 the abdomen, the male of H. nietneri bears a curiously close resem- 

 blance to that of Anisogomphus occipitalis Selys. 



